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WorksheetsWeek 3 Electrical Installation Part 1
Total questions: 10
Worksheet time: 8mins
All the above are examples of conductor, except:
Cooper
Aluminium
Silver
Paper
A good conductor must be able to follow all the above, except:
Transmit current efficiently
Maximum heat released during transmission
Resist fire for considerable period
Fairly light in weight
What is the type of wire for household domestic wiring?
Flexible PVC or PVC/PVC
House Service overhead System (H.S.O.S)
Mineral Insulated Copper Sheathed (M.I.C.S)
Paper Insulated Lead Sheath Steel Tape Armoured
What is the advantage of underground cable?
Less durable to the environment
Very expensive
Safety factors are higher
Can withstand until 150 degree celcius
How does Capacity of Voltages and Current can effect the choosen of wire and cable?
Bigger wire will be able handle higher voltage
Able to resist biting or gnawing of vermins or rodents
Voltage drop will exceed 2.5% of voltage supply
Anti-corrosive to chemical or acid.
Which statement is correct about Stranded vs Solid Wire?
smaller strands wire can carry more power
smaller strands are less expensive
solid wire can carry more power
electricity flows through the middle of wire
What is the purposes of ducting?
To increase voltage
To provide extra protection against pest & accident
To ensure electricity is not leak from wire/cable
To utilize the common underground trenches with other utilities
All below are TRUE about conduit, except:
Rectangular or square ducting bigger in size
Protects the cable from physical damage and heat.
Material: Galvanised iron (GI) & Unplasticized polyvinyl chloride (UPVC)
Circular ducting, smaller in size
The metal tray has different sizes of holes, so that plastic or aluminum grip can hold the cables or wire to the tray.
True
False
If you are required to choose between trunking and conduit for wire installation in your house, which one is your choice? Justify your answer.
